CVE-2026-33826

8.0

HIGH CVSS 3.1

Windows Active Directory Remote Code Execution Vulnerability

Overview

Description

Improper input validation in Windows Active Directory allows an authorized attacker to execute code over an adjacent network.

Details

INFO

Published Date :

April 14, 2026, 6:17 p.m.

Last Modified :

April 17, 2026, 7:19 p.m.

Remotely Exploit :

No

Source :

[email protected]

Impact

Affected Products

The following products are affected by CVE-2026-33826 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID	Vendor	Product
1	Microsoft	windows_server_2012
2	Microsoft	windows_server_2016
3	Microsoft	windows_server_2019
4	Microsoft	windows_server_2022
5	Microsoft	windows_server_2022_23h2
6	Microsoft	windows_server_23h2
7	Microsoft	windows_server_2012_r2
8	Microsoft	windows_server_2025

: Total Affected Vendor : 1 | Products : 8

Scoring

CVSS Scores

The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.

Score	Version	Severity	Vector	Exploitability Score	Impact Score	Source
	CVSS 3.1	HIGH				f38d906d-7342-40ea-92c1-6c4a2c6478c8
	CVSS 3.1	HIGH				[email protected]

Public PoC/Exploit Available at Github

CVE-2026-33826 has a 4 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-33826.

URL	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33826	Vendor Advisory

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-33826 is associated with the following CWEs:

CWE-20: Improper Input Validation

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-33826 weaknesses.

CAPEC-3: Using Leading 'Ghost' Character Sequences to Bypass Input Filters Using Leading 'Ghost' Character Sequences to Bypass Input Filters CAPEC-7: Blind SQL Injection Blind SQL Injection CAPEC-8: Buffer Overflow in an API Call Buffer Overflow in an API Call CAPEC-9: Buffer Overflow in Local Command-Line Utilities Buffer Overflow in Local Command-Line Utilities CAPEC-10: Buffer Overflow via Environment Variables Buffer Overflow via Environment Variables CAPEC-13: Subverting Environment Variable Values Subverting Environment Variable Values CAPEC-14: Client-side Injection-induced Buffer Overflow Client-side Injection-induced Buffer Overflow CAPEC-22: Exploiting Trust in Client Exploiting Trust in Client CAPEC-23: File Content Injection File Content Injection CAPEC-24: Filter Failure through Buffer Overflow Filter Failure through Buffer Overflow CAPEC-28: Fuzzing Fuzzing CAPEC-31: Accessing/Intercepting/Modifying HTTP Cookies Accessing/Intercepting/Modifying HTTP Cookies CAPEC-42: MIME Conversion MIME Conversion CAPEC-43: Exploiting Multiple Input Interpretation Layers Exploiting Multiple Input Interpretation Layers CAPEC-45: Buffer Overflow via Symbolic Links Buffer Overflow via Symbolic Links CAPEC-46: Overflow Variables and Tags Overflow Variables and Tags CAPEC-47: Buffer Overflow via Parameter Expansion Buffer Overflow via Parameter Expansion CAPEC-52: Embedding NULL Bytes Embedding NULL Bytes CAPEC-53: Postfix, Null Terminate, and Backslash Postfix, Null Terminate, and Backslash CAPEC-63: Cross-Site Scripting (XSS) Cross-Site Scripting (XSS) CAPEC-64: Using Slashes and URL Encoding Combined to Bypass Validation Logic Using Slashes and URL Encoding Combined to Bypass Validation Logic CAPEC-67: String Format Overflow in syslog() String Format Overflow in syslog() CAPEC-71: Using Unicode Encoding to Bypass Validation Logic Using Unicode Encoding to Bypass Validation Logic CAPEC-72: URL Encoding URL Encoding CAPEC-73: User-Controlled Filename User-Controlled Filename CAPEC-78: Using Escaped Slashes in Alternate Encoding Using Escaped Slashes in Alternate Encoding CAPEC-79: Using Slashes in Alternate Encoding Using Slashes in Alternate Encoding CAPEC-80: Using UTF-8 Encoding to Bypass Validation Logic Using UTF-8 Encoding to Bypass Validation Logic CAPEC-81: Web Server Logs Tampering Web Server Logs Tampering CAPEC-83: XPath Injection XPath Injection CAPEC-85: AJAX Footprinting AJAX Footprinting CAPEC-88: OS Command Injection OS Command Injection CAPEC-101: Server Side Include (SSI) Injection Server Side Include (SSI) Injection CAPEC-104: Cross Zone Scripting Cross Zone Scripting CAPEC-108: Command Line Execution through SQL Injection Command Line Execution through SQL Injection CAPEC-109: Object Relational Mapping Injection Object Relational Mapping Injection CAPEC-110: SQL Injection through SOAP Parameter Tampering SQL Injection through SOAP Parameter Tampering CAPEC-120: Double Encoding Double Encoding CAPEC-135: Format String Injection Format String Injection CAPEC-136: LDAP Injection LDAP Injection CAPEC-153: Input Data Manipulation Input Data Manipulation CAPEC-182: Flash Injection Flash Injection CAPEC-209: XSS Using MIME Type Mismatch XSS Using MIME Type Mismatch CAPEC-230: Serialized Data with Nested Payloads Serialized Data with Nested Payloads CAPEC-231: Oversized Serialized Data Payloads Oversized Serialized Data Payloads CAPEC-250: XML Injection XML Injection CAPEC-261: Fuzzing for garnering other adjacent user/sensitive data Fuzzing for garnering other adjacent user/sensitive data CAPEC-267: Leverage Alternate Encoding Leverage Alternate Encoding CAPEC-473: Signature Spoof Signature Spoof CAPEC-588: DOM-Based XSS DOM-Based XSS CAPEC-664: Server Side Request Forgery Server Side Request Forgery

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

ZEROxYakuza/CVE-2026-33826

None

Python

Updated: 1 week, 1 day ago

0 stars 0 fork 0 watcher

Born at : April 27, 2026, 1:32 p.m. This repo has been linked 1 different CVEs too.

kaleth4/CVE-2026-33826

None

Python C

Updated: 1 week, 6 days ago

0 stars 0 fork 0 watcher

Born at : April 22, 2026, 12:35 p.m. This repo has been linked 1 different CVEs too.

MaikCyberSec/Threat-Hunting-

Threat Hunting based on KQL

Updated: 1 week, 5 days ago

5 stars 0 fork 0 watcher

Born at : Feb. 18, 2026, 8:20 a.m. This repo has been linked 9 different CVEs too.

nomi-sec/PoC-in-GitHub

📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.

security cve exploit poc vulnerability

Updated: 1 week, 4 days ago

7667 stars 1247 fork 1247 watcher

Born at : Dec. 8, 2019, 1:03 p.m. This repo has been linked 749 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-33826 vulnerability anywhere in the article.

CybersecurityNews

Windows Active Directory Vulnerability Allow Attackers to Execute Malicious Code

Microsoft has released urgent security updates to address a critical vulnerability in Windows Active Directory that allows attackers to execute malicious code. Disclosed on April 14, 2026, the vulnera ...

Published Date: Apr 15, 2026 (2 weeks, 6 days ago)

CrowdStrike.com

April 2026 Patch Tuesday: Two Zero-Days and Eight Critical Vulnerabilities Among 164 CVEs

Microsoft has addressed 164 vulnerabilities in its April 2026 security update release, double the number of vulnerabilities in March 2026. These include one exploited zero-day vulnerability, one previ ...

Published Date: Apr 15, 2026 (3 weeks ago)

The Cyber Express

Microsoft Fixes 167 Vulnerabilities in Latest Patch Tuesday Update

Microsoft’s Patch Tuesday April 2026 release has introduced one of the most extensive security update rollouts of the year, addressing a total of 167 vulnerabilities across Windows operating systems a ...

Published Date: Apr 15, 2026 (3 weeks ago)

Daily CyberSecurity

Urgent Patch Alert: SharePoint Spoofing Under Active Attack as Microsoft Releases April 2026 Updates

Microsoft’s April 2026 Patch Tuesday has arrived with a massive security payload, addressing a staggering 163 vulnerabilities, including eight rated as critical. While the volume alone is significant, ...

Published Date: Apr 15, 2026 (3 weeks ago)

TheCyberThrone

Microsoft Patch Tuesday — April 2026

TheCyberThrone | Vulnerability Advisory | April 15, 2026Volume & Scale — A Near-Record ReleaseMicrosoft patched 163 CVEs in the April 2026 Patch Tuesday release — the second largest Patch Tuesday on r ...

Published Date: Apr 15, 2026 (3 weeks ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-33826 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

Initial Analysis by [email protected]

Apr. 17, 2026

Action	Type	Old Value	New Value
Added	CPE Configuration		OR cpe:2.3:o:microsoft:windows_server_2012:r2::::::: cpe:2.3:o:microsoft:windows_server_2016::::::::* versions up to (excluding) 10.0.14393.9060 cpe:2.3:o:microsoft:windows_server_2019::::::::* versions up to (excluding) 10.0.17763.8644 cpe:2.3:o:microsoft:windows_server_2022::::::::* versions up to (excluding) 10.0.20348.5020 cpe:2.3:o:microsoft:windows_server_2022_23h2::::::::* versions up to (excluding) 10.0.25398.2274 cpe:2.3:o:microsoft:windows_server_2025::::::::* versions up to (excluding) 10.0.26100.32690
Added	Reference Type		Microsoft Corporation: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33826 Types: Vendor Advisory

New CVE Received by [email protected]

Apr. 14, 2026

Action	Type	New Value
Added	Description	Improper input validation in Windows Active Directory allows an authorized attacker to execute code over an adjacent network.
Added	CVSS V3.1	AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Added	CWE	CWE-20
Added	Reference	https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33826

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.

CVE-2026-33826

Windows Active Directory Remote Code Execution Vulnerability

Description

INFO

April 14, 2026, 6:17 p.m.

April 17, 2026, 7:19 p.m.

No

[email protected]